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1 VERSION = 2
2 PATCHLEVEL = 6
3 SUBLEVEL = 26
4 EXTRAVERSION =
5 NAME = Rotary Wombat
6
7 # *DOCUMENTATION*
8 # To see a list of typical targets execute "make help"
9 # More info can be located in ./README
10 # Comments in this file are targeted only to the developer, do not
11 # expect to learn how to build the kernel reading this file.
12
13 # Do not:
14 # o use make's built-in rules and variables
15 # (this increases performance and avoids hard-to-debug behaviour);
16 # o print "Entering directory ...";
17 MAKEFLAGS += -rR --no-print-directory
18
19 # We are using a recursive build, so we need to do a little thinking
20 # to get the ordering right.
21 #
22 # Most importantly: sub-Makefiles should only ever modify files in
23 # their own directory. If in some directory we have a dependency on
24 # a file in another dir (which doesn't happen often, but it's often
25 # unavoidable when linking the built-in.o targets which finally
26 # turn into vmlinux), we will call a sub make in that other dir, and
27 # after that we are sure that everything which is in that other dir
28 # is now up to date.
29 #
30 # The only cases where we need to modify files which have global
31 # effects are thus separated out and done before the recursive
32 # descending is started. They are now explicitly listed as the
33 # prepare rule.
34
35 # To put more focus on warnings, be less verbose as default
36 # Use 'make V=1' to see the full commands
37
38 ifdef V
39 ifeq ("$(origin V)", "command line")
40 KBUILD_VERBOSE = $(V)
41 endif
42 endif
43 ifndef KBUILD_VERBOSE
44 KBUILD_VERBOSE = 0
45 endif
46
47 # Call a source code checker (by default, "sparse") as part of the
48 # C compilation.
49 #
50 # Use 'make C=1' to enable checking of only re-compiled files.
51 # Use 'make C=2' to enable checking of *all* source files, regardless
52 # of whether they are re-compiled or not.
53 #
54 # See the file "Documentation/sparse.txt" for more details, including
55 # where to get the "sparse" utility.
56
57 ifdef C
58 ifeq ("$(origin C)", "command line")
59 KBUILD_CHECKSRC = $(C)
60 endif
61 endif
62 ifndef KBUILD_CHECKSRC
63 KBUILD_CHECKSRC = 0
64 endif
65
66 # Use make M=dir to specify directory of external module to build
67 # Old syntax make ... SUBDIRS=$PWD is still supported
68 # Setting the environment variable KBUILD_EXTMOD take precedence
69 ifdef SUBDIRS
70 KBUILD_EXTMOD ?= $(SUBDIRS)
71 endif
72 ifdef M
73 ifeq ("$(origin M)", "command line")
74 KBUILD_EXTMOD := $(M)
75 endif
76 endif
77
78
79 # kbuild supports saving output files in a separate directory.
80 # To locate output files in a separate directory two syntaxes are supported.
81 # In both cases the working directory must be the root of the kernel src.
82 # 1) O=
83 # Use "make O=dir/to/store/output/files/"
84 #
85 # 2) Set KBUILD_OUTPUT
86 # Set the environment variable KBUILD_OUTPUT to point to the directory
87 # where the output files shall be placed.
88 # export KBUILD_OUTPUT=dir/to/store/output/files/
89 # make
90 #
91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
92 # variable.
93
94
95 # KBUILD_SRC is set on invocation of make in OBJ directory
96 # KBUILD_SRC is not intended to be used by the regular user (for now)
97 ifeq ($(KBUILD_SRC),)
98
99 # OK, Make called in directory where kernel src resides
100 # Do we want to locate output files in a separate directory?
101 ifdef O
102 ifeq ("$(origin O)", "command line")
103 KBUILD_OUTPUT := $(O)
104 endif
105 endif
106
107 # That's our default target when none is given on the command line
108 PHONY := _all
109 _all:
110
111 # Cancel implicit rules on top Makefile
112 $(CURDIR)/Makefile Makefile: ;
113
114 ifneq ($(KBUILD_OUTPUT),)
115 # Invoke a second make in the output directory, passing relevant variables
116 # check that the output directory actually exists
117 saved-output := $(KBUILD_OUTPUT)
118 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
119 $(if $(KBUILD_OUTPUT),, \
120 $(error output directory "$(saved-output)" does not exist))
121
122 PHONY += $(MAKECMDGOALS) sub-make
123
124 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
125 $(Q)@:
126
127 sub-make: FORCE
128 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
129 KBUILD_SRC=$(CURDIR) \
130 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
131 $(filter-out _all sub-make,$(MAKECMDGOALS))
132
133 # Leave processing to above invocation of make
134 skip-makefile := 1
135 endif # ifneq ($(KBUILD_OUTPUT),)
136 endif # ifeq ($(KBUILD_SRC),)
137
138 # We process the rest of the Makefile if this is the final invocation of make
139 ifeq ($(skip-makefile),)
140
141 # If building an external module we do not care about the all: rule
142 # but instead _all depend on modules
143 PHONY += all
144 ifeq ($(KBUILD_EXTMOD),)
145 _all: all
146 else
147 _all: modules
148 endif
149
150 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
151 TOPDIR := $(srctree)
152 # FIXME - TOPDIR is obsolete, use srctree/objtree
153 objtree := $(CURDIR)
154 src := $(srctree)
155 obj := $(objtree)
156
157 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
158
159 export srctree objtree VPATH TOPDIR
160
161
162 # SUBARCH tells the usermode build what the underlying arch is. That is set
163 # first, and if a usermode build is happening, the "ARCH=um" on the command
164 # line overrides the setting of ARCH below. If a native build is happening,
165 # then ARCH is assigned, getting whatever value it gets normally, and
166 # SUBARCH is subsequently ignored.
167
168 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
169 -e s/arm.*/arm/ -e s/sa110/arm/ \
170 -e s/s390x/s390/ -e s/parisc64/parisc/ \
171 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
172 -e s/sh.*/sh/ )
173
174 # Cross compiling and selecting different set of gcc/bin-utils
175 # ---------------------------------------------------------------------------
176 #
177 # When performing cross compilation for other architectures ARCH shall be set
178 # to the target architecture. (See arch/* for the possibilities).
179 # ARCH can be set during invocation of make:
180 # make ARCH=ia64
181 # Another way is to have ARCH set in the environment.
182 # The default ARCH is the host where make is executed.
183
184 # CROSS_COMPILE specify the prefix used for all executables used
185 # during compilation. Only gcc and related bin-utils executables
186 # are prefixed with $(CROSS_COMPILE).
187 # CROSS_COMPILE can be set on the command line
188 # make CROSS_COMPILE=ia64-linux-
189 # Alternatively CROSS_COMPILE can be set in the environment.
190 # Default value for CROSS_COMPILE is not to prefix executables
191 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
192 export KBUILD_BUILDHOST := $(SUBARCH)
193 ARCH ?= $(SUBARCH)
194 CROSS_COMPILE ?=
195
196 # Architecture as present in compile.h
197 UTS_MACHINE := $(ARCH)
198 SRCARCH := $(ARCH)
199
200 # Additional ARCH settings for x86
201 ifeq ($(ARCH),i386)
202 SRCARCH := x86
203 endif
204 ifeq ($(ARCH),x86_64)
205 SRCARCH := x86
206 endif
207
208 # Where to locate arch specific headers
209 hdr-arch := $(SRCARCH)
210
211 KCONFIG_CONFIG ?= .config
212
213 # SHELL used by kbuild
214 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
215 else if [ -x /bin/bash ]; then echo /bin/bash; \
216 else echo sh; fi ; fi)
217
218 HOSTCC = gcc
219 HOSTCXX = g++
220 HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
221 HOSTCXXFLAGS = -O2
222
223 # Decide whether to build built-in, modular, or both.
224 # Normally, just do built-in.
225
226 KBUILD_MODULES :=
227 KBUILD_BUILTIN := 1
228
229 # If we have only "make modules", don't compile built-in objects.
230 # When we're building modules with modversions, we need to consider
231 # the built-in objects during the descend as well, in order to
232 # make sure the checksums are up to date before we record them.
233
234 ifeq ($(MAKECMDGOALS),modules)
235 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
236 endif
237
238 # If we have "make <whatever> modules", compile modules
239 # in addition to whatever we do anyway.
240 # Just "make" or "make all" shall build modules as well
241
242 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
243 KBUILD_MODULES := 1
244 endif
245
246 ifeq ($(MAKECMDGOALS),)
247 KBUILD_MODULES := 1
248 endif
249
250 export KBUILD_MODULES KBUILD_BUILTIN
251 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
252
253 # Beautify output
254 # ---------------------------------------------------------------------------
255 #
256 # Normally, we echo the whole command before executing it. By making
257 # that echo $($(quiet)$(cmd)), we now have the possibility to set
258 # $(quiet) to choose other forms of output instead, e.g.
259 #
260 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
261 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
262 #
263 # If $(quiet) is empty, the whole command will be printed.
264 # If it is set to "quiet_", only the short version will be printed.
265 # If it is set to "silent_", nothing will be printed at all, since
266 # the variable $(silent_cmd_cc_o_c) doesn't exist.
267 #
268 # A simple variant is to prefix commands with $(Q) - that's useful
269 # for commands that shall be hidden in non-verbose mode.
270 #
271 # $(Q)ln $@ :<
272 #
273 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
274 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
275
276 ifeq ($(KBUILD_VERBOSE),1)
277 quiet =
278 Q =
279 else
280 quiet=quiet_
281 Q = @
282 endif
283
284 # If the user is running make -s (silent mode), suppress echoing of
285 # commands
286
287 ifneq ($(findstring s,$(MAKEFLAGS)),)
288 quiet=silent_
289 endif
290
291 export quiet Q KBUILD_VERBOSE
292
293
294 # Look for make include files relative to root of kernel src
295 MAKEFLAGS += --include-dir=$(srctree)
296
297 # We need some generic definitions (do not try to remake the file).
298 $(srctree)/scripts/Kbuild.include: ;
299 include $(srctree)/scripts/Kbuild.include
300
301 # Make variables (CC, etc...)
302
303 AS = $(CROSS_COMPILE)as
304 LD = $(CROSS_COMPILE)ld
305 CC = $(CROSS_COMPILE)gcc
306 CPP = $(CC) -E
307 AR = $(CROSS_COMPILE)ar
308 NM = $(CROSS_COMPILE)nm
309 STRIP = $(CROSS_COMPILE)strip
310 OBJCOPY = $(CROSS_COMPILE)objcopy
311 OBJDUMP = $(CROSS_COMPILE)objdump
312 AWK = awk
313 GENKSYMS = scripts/genksyms/genksyms
314 DEPMOD = /sbin/depmod
315 KALLSYMS = scripts/kallsyms
316 PERL = perl
317 CHECK = sparse
318
319 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
320 MODFLAGS = -DMODULE
321 CFLAGS_MODULE = $(MODFLAGS)
322 AFLAGS_MODULE = $(MODFLAGS)
323 LDFLAGS_MODULE =
324 CFLAGS_KERNEL =
325 AFLAGS_KERNEL =
326
327
328 # Use LINUXINCLUDE when you must reference the include/ directory.
329 # Needed to be compatible with the O= option
330 LINUXINCLUDE := -Iinclude \
331 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
332 -I$(srctree)/arch/$(hdr-arch)/include \
333 -include include/linux/autoconf.h
334
335 KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
336
337 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
338 -fno-strict-aliasing -fno-common \
339 -Werror-implicit-function-declaration
340 KBUILD_AFLAGS := -D__ASSEMBLY__
341
342 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
343 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
344 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
345
346 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
347 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
348 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
349 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
350
351 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
352 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
353 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
354
355 # When compiling out-of-tree modules, put MODVERDIR in the module
356 # tree rather than in the kernel tree. The kernel tree might
357 # even be read-only.
358 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
359
360 # Files to ignore in find ... statements
361
362 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
363 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
364
365 # ===========================================================================
366 # Rules shared between *config targets and build targets
367
368 # Basic helpers built in scripts/
369 PHONY += scripts_basic
370 scripts_basic:
371 $(Q)$(MAKE) $(build)=scripts/basic
372
373 # To avoid any implicit rule to kick in, define an empty command.
374 scripts/basic/%: scripts_basic ;
375
376 PHONY += outputmakefile
377 # outputmakefile generates a Makefile in the output directory, if using a
378 # separate output directory. This allows convenient use of make in the
379 # output directory.
380 outputmakefile:
381 ifneq ($(KBUILD_SRC),)
382 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
383 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
384 endif
385
386 # To make sure we do not include .config for any of the *config targets
387 # catch them early, and hand them over to scripts/kconfig/Makefile
388 # It is allowed to specify more targets when calling make, including
389 # mixing *config targets and build targets.
390 # For example 'make oldconfig all'.
391 # Detect when mixed targets is specified, and make a second invocation
392 # of make so .config is not included in this case either (for *config).
393
394 no-dot-config-targets := clean mrproper distclean \
395 cscope TAGS tags help %docs check% \
396 include/linux/version.h headers_% \
397 kernelrelease kernelversion
398
399 config-targets := 0
400 mixed-targets := 0
401 dot-config := 1
402
403 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
404 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
405 dot-config := 0
406 endif
407 endif
408
409 ifeq ($(KBUILD_EXTMOD),)
410 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
411 config-targets := 1
412 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
413 mixed-targets := 1
414 endif
415 endif
416 endif
417
418 ifeq ($(mixed-targets),1)
419 # ===========================================================================
420 # We're called with mixed targets (*config and build targets).
421 # Handle them one by one.
422
423 %:: FORCE
424 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
425
426 else
427 ifeq ($(config-targets),1)
428 # ===========================================================================
429 # *config targets only - make sure prerequisites are updated, and descend
430 # in scripts/kconfig to make the *config target
431
432 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
433 # KBUILD_DEFCONFIG may point out an alternative default configuration
434 # used for 'make defconfig'
435 include $(srctree)/arch/$(SRCARCH)/Makefile
436 export KBUILD_DEFCONFIG
437
438 config %config: scripts_basic outputmakefile FORCE
439 $(Q)mkdir -p include/linux include/config
440 $(Q)$(MAKE) $(build)=scripts/kconfig $@
441
442 else
443 # ===========================================================================
444 # Build targets only - this includes vmlinux, arch specific targets, clean
445 # targets and others. In general all targets except *config targets.
446
447 ifeq ($(KBUILD_EXTMOD),)
448 # Additional helpers built in scripts/
449 # Carefully list dependencies so we do not try to build scripts twice
450 # in parallel
451 PHONY += scripts
452 scripts: scripts_basic include/config/auto.conf
453 $(Q)$(MAKE) $(build)=$(@)
454
455 # Objects we will link into vmlinux / subdirs we need to visit
456 init-y := init/
457 drivers-y := drivers/ sound/ firmware/
458 net-y := net/
459 libs-y := lib/
460 core-y := usr/
461 endif # KBUILD_EXTMOD
462
463 ifeq ($(dot-config),1)
464 # Read in config
465 -include include/config/auto.conf
466
467 ifeq ($(KBUILD_EXTMOD),)
468 # Read in dependencies to all Kconfig* files, make sure to run
469 # oldconfig if changes are detected.
470 -include include/config/auto.conf.cmd
471
472 # To avoid any implicit rule to kick in, define an empty command
473 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
474
475 # If .config is newer than include/config/auto.conf, someone tinkered
476 # with it and forgot to run make oldconfig.
477 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
478 # we execute the config step to be sure to catch updated Kconfig files
479 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
480 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
481 else
482 # external modules needs include/linux/autoconf.h and include/config/auto.conf
483 # but do not care if they are up-to-date. Use auto.conf to trigger the test
484 PHONY += include/config/auto.conf
485
486 include/config/auto.conf:
487 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \
488 echo; \
489 echo " ERROR: Kernel configuration is invalid."; \
490 echo " include/linux/autoconf.h or $@ are missing."; \
491 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
492 echo; \
493 /bin/false)
494
495 endif # KBUILD_EXTMOD
496
497 else
498 # Dummy target needed, because used as prerequisite
499 include/config/auto.conf: ;
500 endif # $(dot-config)
501
502 # The all: target is the default when no target is given on the
503 # command line.
504 # This allow a user to issue only 'make' to build a kernel including modules
505 # Defaults vmlinux but it is usually overridden in the arch makefile
506 all: vmlinux
507
508 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
509 KBUILD_CFLAGS += -Os
510 else
511 KBUILD_CFLAGS += -O2
512 endif
513
514 include $(srctree)/arch/$(SRCARCH)/Makefile
515
516 ifneq (CONFIG_FRAME_WARN,0)
517 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
518 endif
519
520 # Force gcc to behave correct even for buggy distributions
521 # Arch Makefiles may override this setting
522 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
523
524 ifdef CONFIG_FRAME_POINTER
525 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
526 else
527 KBUILD_CFLAGS += -fomit-frame-pointer
528 endif
529
530 ifdef CONFIG_DEBUG_INFO
531 KBUILD_CFLAGS += -g
532 KBUILD_AFLAGS += -gdwarf-2
533 endif
534
535 ifdef CONFIG_FTRACE
536 KBUILD_CFLAGS += -pg
537 endif
538
539 # We trigger additional mismatches with less inlining
540 ifdef CONFIG_DEBUG_SECTION_MISMATCH
541 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
542 endif
543
544 # arch Makefile may override CC so keep this after arch Makefile is included
545 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
546 CHECKFLAGS += $(NOSTDINC_FLAGS)
547
548 # warn about C99 declaration after statement
549 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
550
551 # disable pointer signed / unsigned warnings in gcc 4.0
552 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
553
554 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
555 # But warn user when we do so
556 warn-assign = \
557 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
558
559 ifneq ($(KCPPFLAGS),)
560 $(call warn-assign,CPPFLAGS)
561 KBUILD_CPPFLAGS += $(KCPPFLAGS)
562 endif
563 ifneq ($(KAFLAGS),)
564 $(call warn-assign,AFLAGS)
565 KBUILD_AFLAGS += $(KAFLAGS)
566 endif
567 ifneq ($(KCFLAGS),)
568 $(call warn-assign,CFLAGS)
569 KBUILD_CFLAGS += $(KCFLAGS)
570 endif
571
572 # Use --build-id when available.
573 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
574 $(call ld-option, -Wl$(comma)--build-id,))
575 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
576 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
577
578 # Default kernel image to build when no specific target is given.
579 # KBUILD_IMAGE may be overruled on the command line or
580 # set in the environment
581 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
582 # this default value
583 export KBUILD_IMAGE ?= vmlinux
584
585 #
586 # INSTALL_PATH specifies where to place the updated kernel and system map
587 # images. Default is /boot, but you can set it to other values
588 export INSTALL_PATH ?= /boot
589
590 #
591 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
592 # relocations required by build roots. This is not defined in the
593 # makefile but the argument can be passed to make if needed.
594 #
595
596 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
597 export MODLIB
598
599 #
600 # INSTALL_MOD_STRIP, if defined, will cause modules to be
601 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
602 # the default option --strip-debug will be used. Otherwise,
603 # INSTALL_MOD_STRIP will used as the options to the strip command.
604
605 ifdef INSTALL_MOD_STRIP
606 ifeq ($(INSTALL_MOD_STRIP),1)
607 mod_strip_cmd = $(STRIP) --strip-debug
608 else
609 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
610 endif # INSTALL_MOD_STRIP=1
611 else
612 mod_strip_cmd = true
613 endif # INSTALL_MOD_STRIP
614 export mod_strip_cmd
615
616
617 ifeq ($(KBUILD_EXTMOD),)
618 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
619
620 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
621 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
622 $(net-y) $(net-m) $(libs-y) $(libs-m)))
623
624 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
625 $(init-n) $(init-) \
626 $(core-n) $(core-) $(drivers-n) $(drivers-) \
627 $(net-n) $(net-) $(libs-n) $(libs-))))
628
629 init-y := $(patsubst %/, %/built-in.o, $(init-y))
630 core-y := $(patsubst %/, %/built-in.o, $(core-y))
631 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
632 net-y := $(patsubst %/, %/built-in.o, $(net-y))
633 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
634 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
635 libs-y := $(libs-y1) $(libs-y2)
636
637 # Build vmlinux
638 # ---------------------------------------------------------------------------
639 # vmlinux is built from the objects selected by $(vmlinux-init) and
640 # $(vmlinux-main). Most are built-in.o files from top-level directories
641 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
642 # Ordering when linking is important, and $(vmlinux-init) must be first.
643 #
644 # vmlinux
645 # ^
646 # |
647 # +-< $(vmlinux-init)
648 # | +--< init/version.o + more
649 # |
650 # +--< $(vmlinux-main)
651 # | +--< driver/built-in.o mm/built-in.o + more
652 # |
653 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
654 #
655 # vmlinux version (uname -v) cannot be updated during normal
656 # descending-into-subdirs phase since we do not yet know if we need to
657 # update vmlinux.
658 # Therefore this step is delayed until just before final link of vmlinux -
659 # except in the kallsyms case where it is done just before adding the
660 # symbols to the kernel.
661 #
662 # System.map is generated to document addresses of all kernel symbols
663
664 vmlinux-init := $(head-y) $(init-y)
665 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
666 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
667 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
668 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
669
670 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
671 # May be overridden by arch/$(ARCH)/Makefile
672 quiet_cmd_vmlinux__ ?= LD $@
673 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
674 -T $(vmlinux-lds) $(vmlinux-init) \
675 --start-group $(vmlinux-main) --end-group \
676 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
677
678 # Generate new vmlinux version
679 quiet_cmd_vmlinux_version = GEN .version
680 cmd_vmlinux_version = set -e; \
681 if [ ! -r .version ]; then \
682 rm -f .version; \
683 echo 1 >.version; \
684 else \
685 mv .version .old_version; \
686 expr 0$$(cat .old_version) + 1 >.version; \
687 fi; \
688 $(MAKE) $(build)=init
689
690 # Generate System.map
691 quiet_cmd_sysmap = SYSMAP
692 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
693
694 # Link of vmlinux
695 # If CONFIG_KALLSYMS is set .version is already updated
696 # Generate System.map and verify that the content is consistent
697 # Use + in front of the vmlinux_version rule to silent warning with make -j2
698 # First command is ':' to allow us to use + in front of the rule
699 define rule_vmlinux__
700 :
701 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
702
703 $(call cmd,vmlinux__)
704 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
705
706 $(Q)$(if $($(quiet)cmd_sysmap), \
707 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
708 $(cmd_sysmap) $@ System.map; \
709 if [ $$? -ne 0 ]; then \
710 rm -f $@; \
711 /bin/false; \
712 fi;
713 $(verify_kallsyms)
714 endef
715
716
717 ifdef CONFIG_KALLSYMS
718 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
719 # It's a three stage process:
720 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
721 # empty
722 # Running kallsyms on that gives us .tmp_kallsyms1.o with
723 # the right size - vmlinux version (uname -v) is updated during this step
724 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
725 # but due to the added section, some addresses have shifted.
726 # From here, we generate a correct .tmp_kallsyms2.o
727 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
728 # o Verify that the System.map from vmlinux matches the map from
729 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
730 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
731 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
732 # temporary bypass to allow the kernel to be built while the
733 # maintainers work out what went wrong with kallsyms.
734
735 ifdef CONFIG_KALLSYMS_EXTRA_PASS
736 last_kallsyms := 3
737 else
738 last_kallsyms := 2
739 endif
740
741 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
742
743 define verify_kallsyms
744 $(Q)$(if $($(quiet)cmd_sysmap), \
745 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
746 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
747 $(Q)cmp -s System.map .tmp_System.map || \
748 (echo Inconsistent kallsyms data; \
749 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
750 rm .tmp_kallsyms* ; /bin/false )
751 endef
752
753 # Update vmlinux version before link
754 # Use + in front of this rule to silent warning about make -j1
755 # First command is ':' to allow us to use + in front of this rule
756 cmd_ksym_ld = $(cmd_vmlinux__)
757 define rule_ksym_ld
758 :
759 +$(call cmd,vmlinux_version)
760 $(call cmd,vmlinux__)
761 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
762 endef
763
764 # Generate .S file with all kernel symbols
765 quiet_cmd_kallsyms = KSYM $@
766 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
767 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
768
769 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
770 $(call if_changed_dep,as_o_S)
771
772 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
773 $(call cmd,kallsyms)
774
775 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
776 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
777 $(call if_changed_rule,ksym_ld)
778
779 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
780 $(call if_changed,vmlinux__)
781
782 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
783 $(call if_changed,vmlinux__)
784
785 # Needs to visit scripts/ before $(KALLSYMS) can be used.
786 $(KALLSYMS): scripts ;
787
788 # Generate some data for debugging strange kallsyms problems
789 debug_kallsyms: .tmp_map$(last_kallsyms)
790
791 .tmp_map%: .tmp_vmlinux% FORCE
792 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
793
794 .tmp_map3: .tmp_map2
795
796 .tmp_map2: .tmp_map1
797
798 endif # ifdef CONFIG_KALLSYMS
799
800 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
801 # relevant sections renamed as per the linker script.
802 quiet_cmd_vmlinux-modpost = LD $@
803 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
804 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
805 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
806 define rule_vmlinux-modpost
807 :
808 +$(call cmd,vmlinux-modpost)
809 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
810 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
811 endef
812
813 # vmlinux image - including updated kernel symbols
814 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
815 ifdef CONFIG_HEADERS_CHECK
816 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
817 endif
818 ifdef CONFIG_SAMPLES
819 $(Q)$(MAKE) $(build)=samples
820 endif
821 $(call vmlinux-modpost)
822 $(call if_changed_rule,vmlinux__)
823 $(Q)rm -f .old_version
824
825 # build vmlinux.o first to catch section mismatch errors early
826 ifdef CONFIG_KALLSYMS
827 .tmp_vmlinux1: vmlinux.o
828 endif
829
830 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
831 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
832 $(call if_changed_rule,vmlinux-modpost)
833
834 # The actual objects are generated when descending,
835 # make sure no implicit rule kicks in
836 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
837
838 # Handle descending into subdirectories listed in $(vmlinux-dirs)
839 # Preset locale variables to speed up the build process. Limit locale
840 # tweaks to this spot to avoid wrong language settings when running
841 # make menuconfig etc.
842 # Error messages still appears in the original language
843
844 PHONY += $(vmlinux-dirs)
845 $(vmlinux-dirs): prepare scripts
846 $(Q)$(MAKE) $(build)=$@
847
848 # Build the kernel release string
849 #
850 # The KERNELRELEASE value built here is stored in the file
851 # include/config/kernel.release, and is used when executing several
852 # make targets, such as "make install" or "make modules_install."
853 #
854 # The eventual kernel release string consists of the following fields,
855 # shown in a hierarchical format to show how smaller parts are concatenated
856 # to form the larger and final value, with values coming from places like
857 # the Makefile, kernel config options, make command line options and/or
858 # SCM tag information.
859 #
860 # $(KERNELVERSION)
861 # $(VERSION) eg, 2
862 # $(PATCHLEVEL) eg, 6
863 # $(SUBLEVEL) eg, 18
864 # $(EXTRAVERSION) eg, -rc6
865 # $(localver-full)
866 # $(localver)
867 # localversion* (files without backups, containing '~')
868 # $(CONFIG_LOCALVERSION) (from kernel config setting)
869 # $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
870 # ./scripts/setlocalversion (SCM tag, if one exists)
871 # $(LOCALVERSION) (from make command line if provided)
872 #
873 # Note how the final $(localver-auto) string is included *only* if the
874 # kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
875 # moment, only git is supported but other SCMs can edit the script
876 # scripts/setlocalversion and add the appropriate checks as needed.
877
878 pattern = ".*/localversion[^~]*"
879 string = $(shell cat /dev/null \
880 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
881
882 localver = $(subst $(space),, $(string) \
883 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
884
885 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
886 # and if the SCM is know a tag from the SCM is appended.
887 # The appended tag is determined by the SCM used.
888 #
889 # Currently, only git is supported.
890 # Other SCMs can edit scripts/setlocalversion and add the appropriate
891 # checks as needed.
892 ifdef CONFIG_LOCALVERSION_AUTO
893 _localver-auto = $(shell $(CONFIG_SHELL) \
894 $(srctree)/scripts/setlocalversion $(srctree))
895 localver-auto = $(LOCALVERSION)$(_localver-auto)
896 endif
897
898 localver-full = $(localver)$(localver-auto)
899
900 # Store (new) KERNELRELASE string in include/config/kernel.release
901 kernelrelease = $(KERNELVERSION)$(localver-full)
902 include/config/kernel.release: include/config/auto.conf FORCE
903 $(Q)rm -f $@
904 $(Q)echo $(kernelrelease) > $@
905
906
907 # Things we need to do before we recursively start building the kernel
908 # or the modules are listed in "prepare".
909 # A multi level approach is used. prepareN is processed before prepareN-1.
910 # archprepare is used in arch Makefiles and when processed asm symlink,
911 # version.h and scripts_basic is processed / created.
912
913 # Listed in dependency order
914 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
915
916 # prepare3 is used to check if we are building in a separate output directory,
917 # and if so do:
918 # 1) Check that make has not been executed in the kernel src $(srctree)
919 # 2) Create the include2 directory, used for the second asm symlink
920 prepare3: include/config/kernel.release
921 ifneq ($(KBUILD_SRC),)
922 @echo ' Using $(srctree) as source for kernel'
923 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
924 echo " $(srctree) is not clean, please run 'make mrproper'";\
925 echo " in the '$(srctree)' directory.";\
926 /bin/false; \
927 fi;
928 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
929 $(Q)if [ -e $(srctree)/include/asm-$(SRCARCH)/system.h ]; then \
930 ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm; \
931 fi
932 endif
933
934 # prepare2 creates a makefile if using a separate output directory
935 prepare2: prepare3 outputmakefile
936
937 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
938 include/asm include/config/auto.conf
939 $(cmd_crmodverdir)
940
941 archprepare: prepare1 scripts_basic
942
943 prepare0: archprepare FORCE
944 $(Q)$(MAKE) $(build)=.
945 $(Q)$(MAKE) $(build)=. missing-syscalls
946
947 # All the preparing..
948 prepare: prepare0
949
950 # Leave this as default for preprocessing vmlinux.lds.S, which is now
951 # done in arch/$(ARCH)/kernel/Makefile
952
953 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
954
955 # The asm symlink changes when $(ARCH) changes.
956 # Detect this and ask user to run make mrproper
957 define check-symlink
958 set -e; \
959 if [ -L include/asm ]; then \
960 asmlink=`readlink include/asm | cut -d '-' -f 2`; \
961 if [ "$$asmlink" != "$(SRCARCH)" ]; then \
962 echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
963 echo " set ARCH or save .config and run 'make mrproper' to fix it"; \
964 exit 1; \
965 fi; \
966 fi
967 endef
968
969 # We create the target directory of the symlink if it does
970 # not exist so the test in chack-symlink works and we have a
971 # directory for generated filesas used by some architectures.
972 define create-symlink
973 if [ ! -L include/asm ]; then \
974 echo ' SYMLINK $@ -> include/asm-$(SRCARCH)'; \
975 if [ ! -d include/asm-$(SRCARCH) ]; then \
976 mkdir -p include/asm-$(SRCARCH); \
977 fi; \
978 ln -fsn asm-$(SRCARCH) $@; \
979 fi
980 endef
981
982 include/asm: FORCE
983 $(Q)$(check-symlink)
984 $(Q)$(create-symlink)
985
986 # Generate some files
987 # ---------------------------------------------------------------------------
988
989 # KERNELRELEASE can change from a few different places, meaning version.h
990 # needs to be updated, so this check is forced on all builds
991
992 uts_len := 64
993 define filechk_utsrelease.h
994 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
995 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
996 exit 1; \
997 fi; \
998 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
999 endef
1000
1001 define filechk_version.h
1002 (echo \#define LINUX_VERSION_CODE $(shell \
1003 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1004 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1005 endef
1006
1007 include/linux/version.h: $(srctree)/Makefile FORCE
1008 $(call filechk,version.h)
1009
1010 include/linux/utsrelease.h: include/config/kernel.release FORCE
1011 $(call filechk,utsrelease.h)
1012
1013 # ---------------------------------------------------------------------------
1014
1015 PHONY += depend dep
1016 depend dep:
1017 @echo '*** Warning: make $@ is unnecessary now.'
1018
1019 # ---------------------------------------------------------------------------
1020 # Firmware install
1021 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1022 export INSTALL_FW_PATH
1023
1024 PHONY += firmware_install
1025 firmware_install: FORCE
1026 @mkdir -p $(objtree)/firmware
1027 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1028
1029 # ---------------------------------------------------------------------------
1030 # Kernel headers
1031
1032 #Default location for installed headers
1033 export INSTALL_HDR_PATH = $(objtree)/usr
1034
1035 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1036 # Find out where the Kbuild file is located to support
1037 # arch/$(ARCH)/include/asm
1038 hdr-dir = $(strip \
1039 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1040 arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1041
1042 # If we do an all arch process set dst to asm-$(hdr-arch)
1043 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1044
1045 PHONY += __headers
1046 __headers: include/linux/version.h scripts_basic FORCE
1047 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1048
1049 PHONY += headers_install_all
1050 headers_install_all:
1051 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1052
1053 PHONY += headers_install
1054 headers_install: __headers
1055 $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1056 $(error Headers not exportable for the $(SRCARCH) architecture))
1057 $(Q)$(MAKE) $(hdr-inst)=include
1058 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1059
1060 PHONY += headers_check_all
1061 headers_check_all: headers_install_all
1062 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1063
1064 PHONY += headers_check
1065 headers_check: headers_install
1066 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1067 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1068
1069 # ---------------------------------------------------------------------------
1070 # Modules
1071
1072 ifdef CONFIG_MODULES
1073
1074 # By default, build modules as well
1075
1076 all: modules
1077
1078 # Build modules
1079 #
1080 # A module can be listed more than once in obj-m resulting in
1081 # duplicate lines in modules.order files. Those are removed
1082 # using awk while concatenating to the final file.
1083
1084 PHONY += modules
1085 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1086 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1087 @echo ' Building modules, stage 2.';
1088 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1089 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1090
1091
1092 # Target to prepare building external modules
1093 PHONY += modules_prepare
1094 modules_prepare: prepare scripts
1095
1096 # Target to install modules
1097 PHONY += modules_install
1098 modules_install: _modinst_ _modinst_post
1099
1100 PHONY += _modinst_
1101 _modinst_:
1102 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1103 echo "Warning: you may need to install module-init-tools"; \
1104 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1105 sleep 1; \
1106 fi
1107 @rm -rf $(MODLIB)/kernel
1108 @rm -f $(MODLIB)/source
1109 @mkdir -p $(MODLIB)/kernel
1110 @ln -s $(srctree) $(MODLIB)/source
1111 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1112 rm -f $(MODLIB)/build ; \
1113 ln -s $(objtree) $(MODLIB)/build ; \
1114 fi
1115 @cp -f $(objtree)/modules.order $(MODLIB)/
1116 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1117
1118 # This depmod is only for convenience to give the initial
1119 # boot a modules.dep even before / is mounted read-write. However the
1120 # boot script depmod is the master version.
1121 PHONY += _modinst_post
1122 _modinst_post: _modinst_
1123 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1124 $(call cmd,depmod)
1125
1126 else # CONFIG_MODULES
1127
1128 # Modules not configured
1129 # ---------------------------------------------------------------------------
1130
1131 modules modules_install: FORCE
1132 @echo
1133 @echo "The present kernel configuration has modules disabled."
1134 @echo "Type 'make config' and enable loadable module support."
1135 @echo "Then build a kernel with module support enabled."
1136 @echo
1137 @exit 1
1138
1139 endif # CONFIG_MODULES
1140
1141 ###
1142 # Cleaning is done on three levels.
1143 # make clean Delete most generated files
1144 # Leave enough to build external modules
1145 # make mrproper Delete the current configuration, and all generated files
1146 # make distclean Remove editor backup files, patch leftover files and the like
1147
1148 # Directories & files removed with 'make clean'
1149 CLEAN_DIRS += $(MODVERDIR)
1150 CLEAN_FILES += vmlinux System.map \
1151 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1152
1153 # Directories & files removed with 'make mrproper'
1154 MRPROPER_DIRS += include/config include2 usr/include
1155 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1156 include/linux/autoconf.h include/linux/version.h \
1157 include/linux/utsrelease.h \
1158 include/linux/bounds.h include/asm*/asm-offsets.h \
1159 Module.symvers Module.markers tags TAGS cscope*
1160
1161 # clean - Delete most, but leave enough to build external modules
1162 #
1163 clean: rm-dirs := $(CLEAN_DIRS)
1164 clean: rm-files := $(CLEAN_FILES)
1165 clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1166
1167 PHONY += $(clean-dirs) clean archclean
1168 $(clean-dirs):
1169 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1170
1171 clean: archclean $(clean-dirs)
1172 $(call cmd,rmdirs)
1173 $(call cmd,rmfiles)
1174 @find . $(RCS_FIND_IGNORE) \
1175 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1176 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1177 -o -name '*.symtypes' -o -name 'modules.order' \
1178 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \) \
1179 -type f -print | xargs rm -f
1180
1181 # mrproper - Delete all generated files, including .config
1182 #
1183 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1184 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1185 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1186
1187 PHONY += $(mrproper-dirs) mrproper archmrproper
1188 $(mrproper-dirs):
1189 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1190
1191 mrproper: clean archmrproper $(mrproper-dirs)
1192 $(call cmd,rmdirs)
1193 $(call cmd,rmfiles)
1194
1195 # distclean
1196 #
1197 PHONY += distclean
1198
1199 distclean: mrproper
1200 @find $(srctree) $(RCS_FIND_IGNORE) \
1201 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1202 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1203 -o -name '.*.rej' -o -size 0 \
1204 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1205 -type f -print | xargs rm -f
1206
1207
1208 # Packaging of the kernel to various formats
1209 # ---------------------------------------------------------------------------
1210 # rpm target kept for backward compatibility
1211 package-dir := $(srctree)/scripts/package
1212
1213 %pkg: include/config/kernel.release FORCE
1214 $(Q)$(MAKE) $(build)=$(package-dir) $@
1215 rpm: include/config/kernel.release FORCE
1216 $(Q)$(MAKE) $(build)=$(package-dir) $@
1217
1218
1219 # Brief documentation of the typical targets used
1220 # ---------------------------------------------------------------------------
1221
1222 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1223 boards := $(notdir $(boards))
1224 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1225 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1226
1227 help:
1228 @echo 'Cleaning targets:'
1229 @echo ' clean - Remove most generated files but keep the config and'
1230 @echo ' enough build support to build external modules'
1231 @echo ' mrproper - Remove all generated files + config + various backup files'
1232 @echo ' distclean - mrproper + remove editor backup and patch files'
1233 @echo ''
1234 @echo 'Configuration targets:'
1235 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1236 @echo ''
1237 @echo 'Other generic targets:'
1238 @echo ' all - Build all targets marked with [*]'
1239 @echo '* vmlinux - Build the bare kernel'
1240 @echo '* modules - Build all modules'
1241 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1242 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1243 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1244 @echo ' dir/ - Build all files in dir and below'
1245 @echo ' dir/file.[ois] - Build specified target only'
1246 @echo ' dir/file.ko - Build module including final link'
1247 @echo ' prepare - Set up for building external modules'
1248 @echo ' tags/TAGS - Generate tags file for editors'
1249 @echo ' cscope - Generate cscope index'
1250 @echo ' kernelrelease - Output the release version string'
1251 @echo ' kernelversion - Output the version stored in Makefile'
1252 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1253 echo ' (default: $(INSTALL_HDR_PATH))'; \
1254 echo ''
1255 @echo 'Static analysers'
1256 @echo ' checkstack - Generate a list of stack hogs'
1257 @echo ' namespacecheck - Name space analysis on compiled kernel'
1258 @echo ' versioncheck - Sanity check on version.h usage'
1259 @echo ' includecheck - Check for duplicate included header files'
1260 @echo ' export_report - List the usages of all exported symbols'
1261 @echo ' headers_check - Sanity check on exported headers'; \
1262 echo ''
1263 @echo 'Kernel packaging:'
1264 @$(MAKE) $(build)=$(package-dir) help
1265 @echo ''
1266 @echo 'Documentation targets:'
1267 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1268 @echo ''
1269 @echo 'Architecture specific targets ($(SRCARCH)):'
1270 @$(if $(archhelp),$(archhelp),\
1271 echo ' No architecture specific help defined for $(SRCARCH)')
1272 @echo ''
1273 @$(if $(boards), \
1274 $(foreach b, $(boards), \
1275 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1276 echo '')
1277 @$(if $(board-dirs), \
1278 $(foreach b, $(board-dirs), \
1279 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1280 printf " %-16s - Show all of the above\\n" help-boards; \
1281 echo '')
1282
1283 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1284 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1285 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1286 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1287 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1288 @echo ''
1289 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1290 @echo 'For further info see the ./README file'
1291
1292
1293 help-board-dirs := $(addprefix help-,$(board-dirs))
1294
1295 help-boards: $(help-board-dirs)
1296
1297 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1298
1299 $(help-board-dirs): help-%:
1300 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1301 @$(if $(boards-per-dir), \
1302 $(foreach b, $(boards-per-dir), \
1303 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1304 echo '')
1305
1306
1307 # Documentation targets
1308 # ---------------------------------------------------------------------------
1309 %docs: scripts_basic FORCE
1310 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1311
1312 else # KBUILD_EXTMOD
1313
1314 ###
1315 # External module support.
1316 # When building external modules the kernel used as basis is considered
1317 # read-only, and no consistency checks are made and the make
1318 # system is not used on the basis kernel. If updates are required
1319 # in the basis kernel ordinary make commands (without M=...) must
1320 # be used.
1321 #
1322 # The following are the only valid targets when building external
1323 # modules.
1324 # make M=dir clean Delete all automatically generated files
1325 # make M=dir modules Make all modules in specified dir
1326 # make M=dir Same as 'make M=dir modules'
1327 # make M=dir modules_install
1328 # Install the modules built in the module directory
1329 # Assumes install directory is already created
1330
1331 # We are always building modules
1332 KBUILD_MODULES := 1
1333 PHONY += crmodverdir
1334 crmodverdir:
1335 $(cmd_crmodverdir)
1336
1337 PHONY += $(objtree)/Module.symvers
1338 $(objtree)/Module.symvers:
1339 @test -e $(objtree)/Module.symvers || ( \
1340 echo; \
1341 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1342 echo " is missing; modules will have no dependencies and modversions."; \
1343 echo )
1344
1345 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1346 PHONY += $(module-dirs) modules
1347 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1348 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1349
1350 modules: $(module-dirs)
1351 @echo ' Building modules, stage 2.';
1352 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1353
1354 PHONY += modules_install
1355 modules_install: _emodinst_ _emodinst_post
1356
1357 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1358 PHONY += _emodinst_
1359 _emodinst_:
1360 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1361 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1362
1363 PHONY += _emodinst_post
1364 _emodinst_post: _emodinst_
1365 $(call cmd,depmod)
1366
1367 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1368
1369 PHONY += $(clean-dirs) clean
1370 $(clean-dirs):
1371 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1372
1373 clean: rm-dirs := $(MODVERDIR)
1374 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1375 clean: $(clean-dirs)
1376 $(call cmd,rmdirs)
1377 $(call cmd,rmfiles)
1378 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1379 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1380 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1381 -type f -print | xargs rm -f
1382
1383 help:
1384 @echo ' Building external modules.'
1385 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1386 @echo ''
1387 @echo ' modules - default target, build the module(s)'
1388 @echo ' modules_install - install the module'
1389 @echo ' clean - remove generated files in module directory only'
1390 @echo ''
1391
1392 # Dummies...
1393 PHONY += prepare scripts
1394 prepare: ;
1395 scripts: ;
1396 endif # KBUILD_EXTMOD
1397
1398 # Generate tags for editors
1399 # ---------------------------------------------------------------------------
1400
1401 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1402 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1403 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1404
1405 ifeq ($(src),$(obj))
1406 __srctree =
1407 else
1408 __srctree = $(srctree)/
1409 endif
1410
1411 ifeq ($(ALLSOURCE_ARCHS),)
1412 ifeq ($(ARCH),um)
1413 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1414 else
1415 ALLINCLUDE_ARCHS := $(SRCARCH)
1416 endif
1417 else
1418 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1419 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1420 endif
1421
1422 ALLSOURCE_ARCHS := $(SRCARCH)
1423
1424 define find-sources
1425 ( for arch in $(ALLSOURCE_ARCHS) ; do \
1426 find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
1427 -name $1 -print; \
1428 done ; \
1429 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1430 -name $1 -print; \
1431 find $(__srctree)include $(RCS_FIND_IGNORE) \
1432 \( -name config -o -name 'asm-*' \) -prune \
1433 -o -name $1 -print; \
1434 for arch in $(ALLINCLUDE_ARCHS) ; do \
1435 test -e $(__srctree)include/asm-$${arch} && \
1436 find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
1437 -name $1 -print; \
1438 test -e $(__srctree)arch/$${arch}/include/asm && \
1439 find $(__srctree)arch/$${arch}/include/asm $(RCS_FIND_IGNORE) \
1440 -name $1 -print; \
1441 done ; \
1442 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1443 -name $1 -print; \
1444 find $(__srctree) $(RCS_FIND_IGNORE) \
1445 \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \
1446 -name $1 -print; \
1447 )
1448 endef
1449
1450 define all-sources
1451 $(call find-sources,'*.[chS]')
1452 endef
1453 define all-kconfigs
1454 $(call find-sources,'Kconfig*')
1455 endef
1456 define all-defconfigs
1457 $(call find-sources,'defconfig')
1458 endef
1459
1460 define xtags
1461 if $1 --version 2>&1 | grep -iq exuberant; then \
1462 $(all-sources) | xargs $1 -a \
1463 -I __initdata,__exitdata,__acquires,__releases \
1464 -I __read_mostly,____cacheline_aligned,____cacheline_aligned_in_smp,____cacheline_internodealigned_in_smp \
1465 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1466 --extra=+f --c-kinds=+px \
1467 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1468 $(all-kconfigs) | xargs $1 -a \
1469 --langdef=kconfig \
1470 --language-force=kconfig \
1471 --regex-kconfig='/^[[:blank:]]*(menu|)config[[:blank:]]+([[:alnum:]_]+)/\2/'; \
1472 $(all-defconfigs) | xargs -r $1 -a \
1473 --langdef=dotconfig \
1474 --language-force=dotconfig \
1475 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1476 elif $1 --version 2>&1 | grep -iq emacs; then \
1477 $(all-sources) | xargs $1 -a; \
1478 $(all-kconfigs) | xargs $1 -a \
1479 --regex='/^[ \t]*\(\(menu\)*config\)[ \t]+\([a-zA-Z0-9_]+\)/\3/'; \
1480 $(all-defconfigs) | xargs -r $1 -a \
1481 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1482 else \
1483 $(all-sources) | xargs $1 -a; \
1484 fi
1485 endef
1486
1487 quiet_cmd_cscope-file = FILELST cscope.files
1488 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1489
1490 quiet_cmd_cscope = MAKE cscope.out
1491 cmd_cscope = cscope -b
1492
1493 cscope: FORCE
1494 $(call cmd,cscope-file)
1495 $(call cmd,cscope)
1496
1497 quiet_cmd_TAGS = MAKE $@
1498 define cmd_TAGS
1499 rm -f $@; \
1500 $(call xtags,etags)
1501 endef
1502
1503 TAGS: FORCE
1504 $(call cmd,TAGS)
1505
1506 quiet_cmd_tags = MAKE $@
1507 define cmd_tags
1508 rm -f $@; \
1509 $(call xtags,ctags)
1510 endef
1511
1512 tags: FORCE
1513 $(call cmd,tags)
1514
1515
1516 # Scripts to check various things for consistency
1517 # ---------------------------------------------------------------------------
1518
1519 includecheck:
1520 find * $(RCS_FIND_IGNORE) \
1521 -name '*.[hcS]' -type f -print | sort \
1522 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1523
1524 versioncheck:
1525 find * $(RCS_FIND_IGNORE) \
1526 -name '*.[hcS]' -type f -print | sort \
1527 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1528
1529 namespacecheck:
1530 $(PERL) $(srctree)/scripts/namespace.pl
1531
1532 export_report:
1533 $(PERL) $(srctree)/scripts/export_report.pl
1534
1535 endif #ifeq ($(config-targets),1)
1536 endif #ifeq ($(mixed-targets),1)
1537
1538 PHONY += checkstack kernelrelease kernelversion
1539
1540 # UML needs a little special treatment here. It wants to use the host
1541 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1542 # else wants $(ARCH), including people doing cross-builds, which means
1543 # that $(SUBARCH) doesn't work here.
1544 ifeq ($(ARCH), um)
1545 CHECKSTACK_ARCH := $(SUBARCH)
1546 else
1547 CHECKSTACK_ARCH := $(ARCH)
1548 endif
1549 checkstack:
1550 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1551 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1552
1553 kernelrelease:
1554 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1555 $(error kernelrelease not valid - run 'make prepare' to update it))
1556 kernelversion:
1557 @echo $(KERNELVERSION)
1558
1559 # Single targets
1560 # ---------------------------------------------------------------------------
1561 # Single targets are compatible with:
1562 # - build with mixed source and output
1563 # - build with separate output dir 'make O=...'
1564 # - external modules
1565 #
1566 # target-dir => where to store outputfile
1567 # build-dir => directory in kernel source tree to use
1568
1569 ifeq ($(KBUILD_EXTMOD),)
1570 build-dir = $(patsubst %/,%,$(dir $@))
1571 target-dir = $(dir $@)
1572 else
1573 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1574 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1575 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1576 endif
1577
1578 %.s: %.c prepare scripts FORCE
1579 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1580 %.i: %.c prepare scripts FORCE
1581 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1582 %.o: %.c prepare scripts FORCE
1583 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1584 %.lst: %.c prepare scripts FORCE
1585 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1586 %.s: %.S prepare scripts FORCE
1587 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1588 %.o: %.S prepare scripts FORCE
1589 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1590 %.symtypes: %.c prepare scripts FORCE
1591 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1592
1593 # Modules
1594 / %/: prepare scripts FORCE
1595 $(cmd_crmodverdir)
1596 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1597 $(build)=$(build-dir)
1598 %.ko: prepare scripts FORCE
1599 $(cmd_crmodverdir)
1600 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1601 $(build)=$(build-dir) $(@:.ko=.o)
1602 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1603
1604 # FIXME Should go into a make.lib or something
1605 # ===========================================================================
1606
1607 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1608 cmd_rmdirs = rm -rf $(rm-dirs)
1609
1610 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1611 cmd_rmfiles = rm -f $(rm-files)
1612
1613 # Run depmod only if we have System.map and depmod is executable
1614 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1615 cmd_depmod = \
1616 if [ -r System.map -a -x $(DEPMOD) ]; then \
1617 $(DEPMOD) -ae -F System.map \
1618 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r) \
1619 $(KERNELRELEASE); \
1620 fi
1621
1622 # Create temporary dir for module support files
1623 # clean it up only when building all modules
1624 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1625 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1626
1627 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1628 $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
1629 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1630
1631 quiet_cmd_as_o_S = AS $@
1632 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1633
1634 # read all saved command lines
1635
1636 targets := $(wildcard $(sort $(targets)))
1637 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1638
1639 ifneq ($(cmd_files),)
1640 $(cmd_files): ; # Do not try to update included dependency files
1641 include $(cmd_files)
1642 endif
1643
1644 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1645 # Usage:
1646 # $(Q)$(MAKE) $(clean)=dir
1647 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1648
1649 endif # skip-makefile
1650
1651 PHONY += FORCE
1652 FORCE:
1653
1654 # Declare the contents of the .PHONY variable as phony. We keep that
1655 # information in a variable se we can use it in if_changed and friends.
1656 .PHONY: $(PHONY)